Apr 14, 2015 -- Volunteer citizen-mappers continue to make significant contributions to the USGS ability to provide accurate mapping information to the public. Recently, volunteers were asked to update all of the law enforcement structure points in Tennessee. The volunteers answered the call and added, verified, edited, or deleted an amazing 440 points!

In addition, all of the points were quality checked by either a peer reviewer or an advanced editor, so the data was ready to go into The National Map at the conclusion of the challenge.

The volunteer additions and edits will be symbolized on
US Topo maps during the next production cycle for Tennessee, slated for next year.

An exciting addition to the mapping project is
Mapping Challenges. The Challenges asks volunteers to concentrate on specific areas and structure types that need updating. In addition, Challenges encourage volunteers to remain engaged, and incentivizes participation. Once a need is determined, a call to action goes out to the volunteer corps with information on the geographic location and the type of structures that needs updating. Volunteers who participate can earn a series of
virtual recognition badges and are
recognized on social media and
TNMCorps project site.

Using crowd-sourcing techniques, the USGS Volunteered Geographic Information (VGI) project, known as
The National Map Corps (TNMCorps), encourages volunteers to collect manmade structures data in an effort to provide accurate and authoritative spatial map data for the National Geospatial Program’s web-based
The National Map. Structures being updated include schools, hospitals, post offices, police stations and other important public buildings.

Special thanks to the volunteers who participated in this challenge: fconley, HGeisler, Cartograsaurus, TheJ, BCook2, rjerrard, Vindalou, Jwo_rocks, wesward, and alherna4.

"At times, locating structures seems similar to solving puzzles or detective work,” commented fconely, a Challenge veteran and one of the project’s more active participants.

Tools on TNMCorps project site explain how a volunteer can edit any area, regardless of their familiarity with the selected structures, and becoming a volunteer for TNMCorps is easy; register by going to
The National Map Corps Editor. If you have access to the Internet and are willing to dedicate some time to editing map data, we hope you will consider participating.

Screen-shot of the Tennessee Law Enforcement Facility Mapping Challenge showing the more than 440 edited points (green dots). At this scale, many dots contain more than one edited or verified structure. (
high resolution image)

The most recent status graphic showing the number and density of The National Map Corp submitted edits or verification for the past three years. (
high resolution image)